Mike C Posted August 15, 2004 Share Posted August 15, 2004 After months of delay...here are pics of my install of my Precision Gear Limited Slip diff. I am installing it in a 12mm open 3.54 geared R200 that came from an '85 300ZX turbo. First step is to mount the case where I can work on it. Then setting up a magnetic base and a dial indicator perpendicular to the gear teeth, backlash is checked. In this case it was .005, or right on the mark. Then remove the open carrier from the housing using a prybar. Here we have the two differentials side by side, the open diff carrier, and the empty housing: Here is my side bearing puller and the puller in action: I re-used the original bearings for my LSD to save a few bucks.My donor R200 was from a low mileage burnout. Here I am pressing the side bearings on. From here it is back to the diff case. I was able to reuse the original shims for side bearing preload. I buttoned it back up and backlash was a right-on .005. If it was incorrect I was going to have to order shims from Nissan, so having that work out was dandy. Here it is ready to go! Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted August 15, 2004 Share Posted August 15, 2004 See there guys... I knew there was no need to have a pro do it for you... could've done it in your sleep, huh Mike... Thats great info/ pics. Now I may try that myself. The only thing would be, if the backlash wouldn't have come out right.. Quote Link to comment Share on other sites More sharing options...
Dp351zcar Posted August 16, 2004 Share Posted August 16, 2004 Mike that LSD looks just like the one I bought from nismo or I should say MSA did and then sold it to me. It came in the nismo box with instructions I couldn't read. Yes I can read english I just don't write it well. Quote Link to comment Share on other sites More sharing options...
CruxGNZ Posted August 16, 2004 Share Posted August 16, 2004 Well, it's about time . Where did you purchase that side bearing puller? I really could have used one of those, instead of paying the money for new bearings. My press did a number on the old, but still good bearings that I wanted to re-use. Here's a tip for others (looks like you did this too Mike): If you are replacing the old carrier bearings with new ones, simply use a dremel tool and cut the cage off of one of the old bearings, leaving just the inside part (race?) of the bearing. This works perfect to push the new bearings into place, instead of finding the correct size socket or scap metal to use. !M! Quote Link to comment Share on other sites More sharing options...
Mike C Posted August 17, 2004 Author Share Posted August 17, 2004 This is the first Nissan diff that I have done work on, but it's just like the rest of them when you get into it. My T&D depth checker wouldn't work, but the universal Proform one would if you were doing a new gear set. Since I wasn't changing pinions, this wasn't required. The shims are available from Nissan, and the factory service manual gives guidelines for changing shims to adjust. Just don't know how much $ they get for them or how long it would take! The Precision Gear diff I bought came from Reider Racing. At the time it was $550. It is made by Tokigi Fuji who makes the NISMO diff as well. Correct Mat! The old bearings work great on the press. I have a whole box of them. The side bearing puller came from Randy's Ring & Pinion. Dana differentials adjust backlash and preload with shims pressed between the bearing and the diff case. A PITA to adjust, but it's nice not having all the shims fall out when trying to re-install! Quote Link to comment Share on other sites More sharing options...
Tim240z Posted August 17, 2004 Share Posted August 17, 2004 Mike!! Where U been? Quote Link to comment Share on other sites More sharing options...
Mike C Posted August 18, 2004 Author Share Posted August 18, 2004 Hi Tim, Been trying to keep my head above water! Work has me humpin' it, and a little person in the house takes some time as you know! I check in every couple of days, but have been trying to spend more time in the shop. I have my motor in the car, the diff is done, and my trans is installed and the mount modded. I need to get a driveshaft done and the accessories on the motor and hopefully can drive 'er again! Quote Link to comment Share on other sites More sharing options...
Sean73 Posted August 18, 2004 Share Posted August 18, 2004 Mike, I am about to try what you've done with a 240SX viscous carrier, 88 SE halfshafts, and the MM CV adapters. (I am waiting on the halfshafts, to see if they'll fit the carrier). Anyways, I am wondering if you checked the contact pattern on the ring & pinion, or if it's unneccessary once you've checked the backlash. Also, do you really need a press to install the bearings? Do you think heating the bearings up a little (or chilling the carrier in the freezer), then tapping them in with a mallet would work? I am really curious if this swap can be done effectively without any special tools. Thanks for the excellent post. Sean 73 240Z, L28ET, T3/T04E, NPR IC, Z31 ECCS Quote Link to comment Share on other sites More sharing options...
Mike C Posted August 19, 2004 Author Share Posted August 19, 2004 There is no need to check contact pattern if backlash is the same before and after. Since you are not changing the pinion depth, if the backlash hasn't changed, the gears are in exactly the same position. Contact pattern is very difficult to read IMO. Especially with a used gear set. In order to get a proper pattern, you need to put at least 25 lb ft on the gear set. In order to do that, you really need the brakes attached so you can partially engage parking brake. I'm glad you bring that up, when I install a ring gear on a carrier, I put the case in the refrigerator and the ring gear in the oven set on low (about 150 degrees) respectively for 30 minutes. This way you don't take the chance of warping the carrier trying to torque the ring gear down since it is an interference fit. Another lesson learned the hard way unfortunately. My experience with gears has come from my Jimmy. 35" tires on 1/2 ton axles can ramp up your experience quickly. Something like 7 different ones. But moderation with the right foot has helped. To get the old bearings off, you can cut the cage off, then notch the race on two sides, a chisel should get it off. My feelings are that the new bearings would go on with just a few taps if they were heated and the case cooled. You will need a 3rd new bearing or get one of the old bearings off without destroying it to use as a drift to drive the new bearing down flush with the case. Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted July 11, 2005 Share Posted July 11, 2005 Mike' date=' I am about to try what you've done with a 240SX viscous carrier, 88 SE halfshafts, and the MM CV adapters. (I am waiting on the halfshafts, to see if they'll fit the carrier). [/quote'] Hi Sean, I remember this thread, and the part about you using the 88se shafts. Did it ever work out for you? Did you know that the n/a z32 stubs will plug into that carrier your using? I have a pair, they are 5 hole stub shafts from a n/a z32, and I have them engaged into a spare 88se viscious lsd diff I have... just a FYI update.... later joel Quote Link to comment Share on other sites More sharing options...
rags Posted July 11, 2005 Share Posted July 11, 2005 Hi Joel, Can you snap a picture of the Z32 halfshaft? Do you think there is a cost effective way to marry that input shaft with a Z31 or 280zxt cv for installation in a first gen car? Joe Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted July 11, 2005 Share Posted July 11, 2005 Rags, that may be the hard part, or the easy part.... just take some leg work. I'm sure its possible. Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted July 11, 2005 Share Posted July 11, 2005 I wonder if one could use the 1/2 shaft with the 5 hole flange that bolts to these stubs, (240sx, Z31??) and take the other end apart like the guys are doing for the Z32TT R230 diff axle mods, and install the 5 bolt flange on both ends of the 1/2 shaft. Then have a adaptor made like you would with the other diffs for the companion flange. ????? Quote Link to comment Share on other sites More sharing options...
mrcheeze36 Posted July 11, 2005 Share Posted July 11, 2005 I wonder if one could use the 1/2 shaft with the 5 hole flange that bolts to these stubs, (240sx, Z31??) and take the other end apart like the guys are doing for the Z32TT R230 diff axle mods, and install the 5 bolt flange on both ends of the 1/2 shaft. Then have a adaptor made like you would with the other diffs for the companion flange. ????? If the flanges are the same size, how about using the 6 bolt flange on the outer side since there is an adaptor already made for it? If anyone is interested, I have sets of 6 bolt flanges (4 flanges, boots, internals) for sale already taken apart, cleaned, and separated in baggies. And I have Q45 rear ends as well...just shoot me a PM if interested. Quote Link to comment Share on other sites More sharing options...
Leith280zlt1 Posted July 11, 2005 Share Posted July 11, 2005 How much are the shims you would have to order from nissan if the backlash didn't come out right? I would make them myself but for someone who didn't have a machine shop, they would have to order special shims right? Just curious. Thanks. Nice pics BTW! Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted July 11, 2005 Share Posted July 11, 2005 If the flanges are the same size' date=' how about using the 6 bolt flange on the outer side since there is an adaptor already made for it? [/quote'] Thats a great idea... didn't think of that one. Something tells me though, that the Z32TT axle shaft itself, is much beefier than the others, and the spline count / axle size might be bigger, thus not allowing one to mix and match the end peices... Its worth a look though.... Quote Link to comment Share on other sites More sharing options...
rags Posted July 11, 2005 Share Posted July 11, 2005 I know the Q45 axles are bigger not allowing you to marry a turbo Z31 halfshaft with a Q45 inner CV. I've been searching for a year to find the correct CV race to slide onto the turbo z31 shaft that accepts the larger Q45 ball bearings with no luck. Joe Quote Link to comment Share on other sites More sharing options...
rags Posted July 11, 2005 Share Posted July 11, 2005 Anyone know if a NA Z32 halfshaft is the same diameter as a turbo Z31 halfshaft?! Joe Quote Link to comment Share on other sites More sharing options...
Leith280zlt1 Posted July 12, 2005 Share Posted July 12, 2005 Do you know what the torque settings are for the bolts that go in the ring gear? Quote Link to comment Share on other sites More sharing options...
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